really confused

All my pregnancy test came out negative. And I have'nt had a period since april 28th. So I went to the emergency for really bad cramping and they put a catheder in me and thats was it and told me to go home. As soon as I got home I started bleeding heavily for 4 days and it was dark red. not like my usual af. now today im spotting orange and still have all my pregnancy symptoms even a little belly. But my doctor said its acid reflux. but my question is what could it be i need opinions please because this is getting really frustrating.